Jabez burns



(No. Medel.)

J BURNS.

` GRINDING MILL.

Patented Sept. 21, 1886.

WITNESSES INVBNTOR IM e Emme BY /Zm/e /5/5 ATTORNEYS NITED STATES PATENT Urricno JABEZ BURNS, OFv BROOKLYLNEV YORK.

GRlNDlN'G-MILL.

SPECIFICATION forming part of Letters Patent No. 349,628, dated September 21, 1886.

Application filed December 3, 1885. Serial No. 1`4,614. (Nomodcl.)

This invention relates to a grinding-mill having a reversible bed-stone which is dressed on both faces and provided with trunnions or journals at its circumference.

, The object of this invention Vis `to provide novel means for supporting the trunnions or journals and securing the bridge of the mill,

whereby the bedstone can be conveniently and expeditiously reversed.

To such end the invention consists in the construction and combination of deviceshereinafter described and claimed, reference being made to the accompanying drawings, in which- Figure l represents a sectional elevation of a grindingmill provided with a reversible bed-stone. Fig. 2 is a plan or top view of the same. Fig. 3 is a detached face view of one of the boxes which form the bearings for the trunnions of the bed-stone.

Similar letters indicate corresponding'parts.

In the drawings, the letter A designates the runner of a grinding-mill, and B is the bedstone. The runner is firmly mounted upon the vertical arbor 0,'and the bed-stone is hung on trunnions D D, which have their bearings in boxes E E, which are constructed and secmed to the standards G G of the mill-frame, as hereinafter described. The bed-stone is dressed on both faces, and the trunnions extend omv its circumerence at the middle of its thickness, so that either face of the bed-stone can be brought into the proper working position toward the runner simply by reversing said bed-stone. Of course, in dressing the two faces of the bed-stone, care must be taken to arrange such dressing so vthat the bed-stone will work correctly, no matter which of its two faces is brought in working position. If the dressing consists of tangential lines, the lines on one face must run in the same direction to those on the other face.

In order to facilitate the operation of reversing the bedstone, the frame of the mill and the boxes E E are so constructed Ithat said parts can be readilyl taken apart and replaced withp out much loss of time. For this purpose the bridgeIiis secured by means of swing-bolts f f, pivoted at their lower ends to the top portions of the standards G G, and engaging the bifurcated ends ofthe bridge. The boxes E E are secured to the standards by screw clampingbolts K K, so that they can be vertically moved to adjust the bed-stone relatively to the runner, and each box is provided with a cover, I, hinged or pivoted at one end to such box, as at f', and having a bifurcated end, f2, with which engages the swing-'bolt c, pivoted to the box, and by which the cover is held down. By swinging the bolts f from engagement with the bifurcated ends of the bridge F and removing the latter, and then releasing the locking swingbolts of the covers I of the boxes, the bed-stone can be removed and replaced in a reversed position, after which the boxco vers andthe bridge are replaced and secured.

What I claim as new, and desire to secure by Letters Patent, is

l. A grinding mill comprising the standards, the runner-stone, j carnal-boxes secured to said standards and provided with movable Y covers, locking devices for securing said covers down upon the boxes, the reversible bedstone having both faces dressed, and provided with journals attached to its circumference at the middle of its thickness, and the bridge detachably secured to the upper ends Vof the stand? ards, substantially as described.

2. A grinding-mill comprising the standards, a runner-stone, journal-boxes secured to said standards and provided with movable covers, the swing-bolts/for locking the covers down, the reversible bed-stone having both faces dressed, and provided at its circumference with attached journals, and the removable bridge, substantially as described.

3. A grinding-mill comprising the standards, the runner-stone, journal-boxes secured to the standards and provided with hinged covers, locking devices for securing the covers down upon the boxes, the bed-stone provided with journals and dressedA upon both faces, the bridge, and the swing-bolts for detachably securing the bridge, substantially as described.

4. A grinding-mill comprising the standards, the runner-stone, journal-boxes secured to the standards and provided with movable IOO on both faces and having attached journals, and the removable bridge, substantially as described.

In testimony whereof I have hereunto set my 1 5 hand and seal in the presence of two subscribing witnesses.

JABEZ BURNS. [L s] \Vitnesses:

WV. HAUFF, E.A F. llAsrrnNHUnER. 

